Electric signal bell



March 4, 1930. F. ALBRIGHT ET A1. 1,749,175

ELECTRIC SIGNAL BELL Filed DSC. 14, 1926 TTORNEY .s Patented Mar. 4,` 1930.v d

f STATES GFFlC-E -f v'FRANK' ALBRIGHT, 0F BRONX, AND WILLIAM nnsnssnayor' BnooKLYN, NEW Yon-K, f ASSIGNORS 'rosTANLnY & rA'rmnnsomINc., or NEW XQRKN. Y A conronATIoN s OF'NEW YORK' u ELECTRIC sientananni.; r. f

Application mea Decemherigwaej yseriali Ndfisliam.

- The electric bell, described herein and 'shown'v in the drawings belongs properly to ythe plunger-type vibrating bells, `operable on Y, f an alternating current circuit, 'whereby no sparkingcan occur, onl account ofthe absence n of opencontact points, asnow well known in l EleCITOma'gnetically Y operated devices. y

i; the pfeSence 0f inflammable gases would bev alternating current practice.` `Its new fea-y turesy may well be employedin other types of ibell is particularly intended for places where dangerous when using electric make-andbreakdevices, or where the laccumulation oi"V ypliity electric translating devices of Athisgenf V- eral type, Aorvinstanfce, electric'bells,to make l their operation, more leifective and to lower One feature 'of the invention comprises the arrangement of resilient means"k to mechanilcally lassist the electromagnetic y vibratingI dust makes it'diilicultvor impossibleto employ openv contact points. a

The main ob]ectV ofthe invention is to sim- `rtheir cost of construction.

means;l Another one consists in providing means `for changing the distance of 'attracfv tion of the armature in respect tothe electro# magnet, a further one includes means for changing therate oifA vlbratiorrof the above mentioned .resilient means, ,and additional features will become apparent, yas the descrip-k tion andoperation of the inventionjustifies.

l Electric bells of the plunger typeare well vknown inthe art, as for instance,vin U. S.

' entsNonS; 1,052,3542and 1,066,929. The improvements,- fhowever, claimed for this invention andjthought to be broadly new Patenti-No. 1,180,445. Means for mechanical'- ly assisting the electromagnetic operation ofy atrans'lating device are shown in U. Sv.yPat-' over the state of the art, relate particularly7 to i the peculiar resilient, vibratory operation of the strikerror plunger, as yclearly described herein and shownr in the-drawings, in which Fig. 1 z'i`s ka plan viewoi the invention,y the gong ofthe bell being removed and indicated The 'other translating device. a-

iirdashed' lines, Fig. 2, a side elevation and,

brates, are lindicatedat 14;.

f f Armature' 13-carries a resilient member 15, inthe forlnoffa; blade spring, secured to ar mature'l at aV point adjacent tothe axis of its bearingsand on thatside of the armature which'is opposite to the one contacting with the pole-endsof magnet 11. This member 15 isfree toswingaway from'the magnet along its entirelength', but restricted to swing toward'magnet 1,1, bythe body ofy armature 13.Y It may be reenforcedby and 17,y 'acting' as auxiliaries.

A retractile-'spring 18, also carried by armature 13, has its -free end-resting on,"o'r

attached tofand being adjustable by a stop 19. This adjustable stop is employed for ychanging the distance between armature 13 and theipoleV-ends 'of magnet 11 and, there ore, for placingarmature l'noreor less Within the field 'of'attraction of magnet 11,

for regulating-the"operation of the bell or 4other translating' device.'

plunger or striker rod vis loosely secured at one endl 21 to the free-end of spring 15, while'the'otlier end passes'through a guidepost 22 and operates the. gong 23, or

It should be noted that yonfthe energiza'- tion ofmagnet 11 and the attraction of arma'- ture 13, spring 18 is caused Vto pressaga'i'nst .stop 19v which, by .beingraised?` or: lmered,

laminations 16 modies the position of armature 13 with-` in the ield of attraction of magnet 11 and,

, is struck repeatedlyI as long as the circuit energizing the magnetll is closed. There.

are no contacts inthe deVice, eXcept theA single remote closingmeansVV for the circuit.`

When these means are'closed and kept closed, .l

the attraction and repulsion of armature 13 located on the face of said armatureopposite to that adjacent to vsaid magnet, the? resiliency of said lconnecting mel ns being q greater when Vsaid armature is'mpving-to-Qr ward said magnet than when Lmoving away kfrom said magnet.V s f In witness whereof, we have ointlysignedv the foregoing specification, at-New York, in the county and State of New York', day of December, 1926. f

ERAN-K ALBRIGLH'E. v

VWILLIAM 'ELSASSER by magnet 11, is substantially in unison with f the cycle ofthe alternatingcurrent vused in operating the bell. During each cycle, armature-13 Wfllfflst bei-attractedby magnet 11 kand then repelled. At eachpattraction, and

after armature 13 is in momentary Contact with magnet 11 striker 20, due toits inertia,

will continue to travel toward gong 23, and

spring 15 will be bent at the upper end'of armature 13 landtoits connection with striker 20. each'repulsion, however, spring 15 will be bent and partially separated from the armature substantially from they lower end of armaturel and to its clonnection with the striker.l Y

l aff The resiliency of spring 15 whiley pulling, A

is operating along its entire 'length and, much greater' than whenv pushing, where it is limited by the rigidity lof armature 13. V.The

Y ciprocatingstriker @of such character of stroke that when lthey circuitis *momentarilyVVA -.closed kthe acoustic effect ot the `vibrating v lbell is similar tothat of a single stroke bell combined result is an V'operationv ofthe -re,

and, for this reason, even capableY of use and eminently satisfactory for code signaling according to the opening and closing of the .crcuitat a remotey circuit controlling p K `,11orv device, such as aV pushbutton or the Ycode',v l

wheel of a signal transmitter.

We claim z-f Y l; In combination, an electroma-gnet, an

armature, a striker, a translating devicefco- A operating with said striker, means for resiliently 'v -biasing the larmature away fromfthe p magnet, and means for'esiliently connecting `said striker `withsaid armature and located on .the face otsaid armature Yopposite `to that adjacent to saidmagnet, the resiliency offfsaid connecting means `bei-ng greater when 'saidV armature ismoving toward said `magnet than .when-moving away from said magnet. l y

` Q. Incombination, an electromagnet, an armature, a str1ker,means for resiliently i I Aholdingsaid armature away from said mag# net, a` translating device cooperating with -.said striker, and meansy for resiliently conthis 10th 

